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Steel reinforcing rods have minimum overlap requirements to ensure that the reinforcing has a continuous effect throughout the structure.
In some instances this minimum overlap is 600mm, but the requirement does vary and must be confirmed by an Engineer for each particular design.

Maximum overlaps would be used to ensure wastage is reduced, and to ensure adequate concrete cover.

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What is the difference between lap splice length and development length for rebars?

The difference between the two is in the application. A development length is the amount of rebar length that is needed to be embedded or projected into concrete to create a desired bond strength between the two materials. The lap splice length is the length two rebar pieces must overlap and be tied together to create a bond as if there was no break and the run is "continuous". So simply put, development is rebar to concrete, splice is rebar to rebar. The lengths of both splice and development do vary. They are dependent upon different factors. These include but are not limited to concrete strength, rebar size, rebar coating and concrete cover or clearance. So when you see a chart on one project, it can differ from another for these reasons.


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